// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_PUBLIC_BROWSER_TRACING_DELEGATE_H_
#define CONTENT_PUBLIC_BROWSER_TRACING_DELEGATE_H_

#include <memory>
#include <string>

#include "base/callback.h"
#include "content/common/content_export.h"

namespace base {
class DictionaryValue;
}

namespace net {
class URLRequestContextGetter;
}

namespace content {
class BackgroundTracingConfig;
class TraceUploader;

typedef base::Callback<bool(const std::string& metadata_name)>
    MetadataFilterPredicate;

// This can be implemented by the embedder to provide functionality for the
// about://tracing WebUI.
class CONTENT_EXPORT TracingDelegate {
public:
    virtual ~TracingDelegate() { }

    // Provide trace uploading functionality; see trace_uploader.h.
    virtual std::unique_ptr<TraceUploader> GetTraceUploader(
        net::URLRequestContextGetter* request_context)
        = 0;

    // This can be used to veto a particular background tracing scenario.
    virtual bool IsAllowedToBeginBackgroundScenario(
        const BackgroundTracingConfig& config,
        bool requires_anonymized_data);

    virtual bool IsAllowedToEndBackgroundScenario(
        const content::BackgroundTracingConfig& config,
        bool requires_anonymized_data);

    // Used to add any additional metadata to traces.
    virtual void GenerateMetadataDict(base::DictionaryValue* metadata_dict) { }

    virtual MetadataFilterPredicate GetMetadataFilterPredicate();
};

} // namespace content

#endif // CONTENT_PUBLIC_BROWSER_TRACING_DELEGATE_H_
